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Credit: AFP/Getty Images

Incandescent materials, ash and smoke are spewed from Popocatepetl Volcano as seen from the Santiago Xalitxintla, in the Mexican central state of Puebla, on April 21, 2012. Residents of nearby communities reported roaring noises from the Popocatepetl volcano near Mexico City after signs of increased activity prompted authorities to raise alert levels.. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)